Testing device.



PATENTED JAN. 1, 1907.

A. M. MATTIOE.

TESTING DEVICE.

APPLIUATIDI FILED JAN. 11. 1906.

M ER INVENTOR ATTORNEY.

WITNESSES:

1 UNITED STATES PATENT oFEroE.

CHALMERS COMPANY, OF MILWAUKEE, WISCONSIN,

'TION OF NEW JERSEY.

Specification of Letters Patent.

A CORPORA- TESTING DEVICE.

Patented Jan. 1,1907.

Application filed January 11,1906. Serial No. 295,541.

To all whom it may concern:

Be it known that I, ASA M. MATTICE, a citizen of the United States,residin at Mil-' waukee, in the county oLMilwau cc and State ofWisconsin, have invented certain new and useful Improvements in TestingDevices, of which the following is aspec1fication.

My present invention relates to means for testing the extent of wear ofmotor-journals and the position of the rotatable member of a motorrelative to its poles.

It very often happens that the journals of motors, especially of motorsemployed in street-railway work, wear to such an extent that therotatable member or armature moves close enough to the pole-faces of themotor-field to bear against said faces and damage the armature or itswinding very seriously. At the same time a disagreeablenoise is producedby the rubbing of the arma-- ture on the lower pole-faces.

The object of my invention is to reduce the liability of damage to themotor by providing a simple means for testing the extent of wear of thejournals of a motor and for determining the position of the armature orrotatable member of the motor relative to the pole-faces. To this end Iemploy a portable contact device which is adapted, to engage therotatable member of the motor when the latter is in its proper position,in combination in a variety of ways and in connection with illustrates afour-p0 e proved testing device in position.

various types of motors.

In the accompanying drawings, Figure 1 motor, partly in verticalsection, with the armature and my im- Fig. 2 is a vertical section of mytesting device in its preferred form. Fig. 3 is a side view, and ig. 4 aface view, of the upper. part of the device shown in Fig. 2. Fig. 5 is aside view of the bottom part of thetesting device, showing the pre erredform of contact; and Fig. 6 is a modified arrangement of my testindevice.

eferring now to the drawings, the motorarmature or rotatable member isindicated at 7. Said armature is mounted in the journals 8, carried bythe casing 9. The motor shown in Fig. 1 is a four-pole machine, thepoles being arranged ninety degrees apart around the armature. Two ofsaid polesare indicated at 10 and 11 and have mounted thereon,respectively, the coils 12 and 13. Through the upper side of the casing9 one or more openings 14 are provided, throu h which my improvedcontact device may be inserted for' the purpose of determining theposition of the rotatable member or armature within the said casing. Theopening may 'lead to any part of the rotor, or it may even be formed inthe box or journal 8 and lead to the shaft.

The contact device is illustrated in Figs. 1 .and 2 as a self-containedtesting apparatus which is readily portable and, in fact, could becarried around in the pocket of the in-v spector. It consists of a tube15,- having at one end a pair of contacts 16 and 16 and at the other enda signalin device, such as an electric lamp 17. This amp isinclosed by acylinder, of glass, 18, surrounded by a protecting-hood 19, screwed tothe upper end of tube 15. The hood (more clearly shown in Figs. 3 and 4)is provided with openings 20, through which the condition of the lamp 17maybe readily observed. The tube contains a source of current-su ply,such as a small dry battery 21. The l dwer ends of the con tacts 16 and16" are flanged, as shown in Fig. 5, for the purpose of insuring goodcontact with the metallic parts of the rotatable member or armature.casing surrounding the opening 14 is finished at 23 so as to resent asmooth flat surface to the under slde of the limitin collar or shoulder22 on tube 15 when the batter is in position in opening 14.

In the modification illustrated in Fig. 6 I have shown the contactdevice as made upof a rod or tube carrying contacts 16 and 16 at itslower end and provided with limitin collar 22. This device, however, isnot eel?- The part of the motor- .contained, the contacts beingconnected to a the metallic parts thereof before the collar 22 engagesthe finishedsurface 23 surrounding opemng 14. An electrical circuit willthus be completed, which may be traced in Fig. 2 as follows: frombattery 21 lamp 17, contact 16, metallic part of rotatable member '7,contact 16 to battery. In Fig. 6 the circuit may be traced from battery21, contact 16, metallic part of rotatable member 7, contact 16,electric bell 17 a to battery. In either case a signal is operated whichindicates that the armature is in its proper position. If, however,the-journals have worn so far as to permit the rotatable member toapproach dangerously near the lower pole-faces, such as 10, the collar22 will rest on the finished surface 23 and prevent the contacts 16 and-16" engaging the rotatable member. In such a case the electric circuitis not completed, and the ins ector is immediately made'aware of thecondition of affairs.

I aim in the appended claims to coverall modifications which do notinvolve a departure from the spirit and scope of my in vention' Havingthus described my invention, what I desire toclaim and to cover byLetters Patent is 1. As a means for testing the relative position ofmotor-armature and the pole-' faces below same, a portable contactdevice adapted to engage the armature when the latter is in its properposition, in combination with a source of current-supply, and a signaldevice in circuit with said contact device and said source of supply,and means themotor-armature is in its properposition, the contacts 16and 16" will engage opening in the upper part of its casing; and -meansfor indicating the position of t e for preventing said contact devicefrom engagin the armature when the latter has move into dangerousproximity to the lower poles ,of the motor.

2. As a means for testing the extent of Wear of the journals of a motorby inserting an indicating device through'anop'ening in themotor-casing, a tube ,rovided with electrical contacts at one en asignal device at the other end, a source of current-supply within thetube, and a collar for limiting the movement of the tube through the"opening in the motor-casing.

3. As a means for determining the position of a motor-armature relativeto its pole-faces by inserting an indicating device" throu h an openingin the motor-casing, apair 0 contacts, portable means upon which saidcontacts are mounted adapted to pass through the opening in themotor-casing, a source of current-supply connected to said contacts,

and a si aling device connected in circuit with sar contacts and saidsource of currentsupply. I 3' 4. In combination, amotor having anrotatable member relative to the'poles of said motor, comprising aportable contact device adapted to engage the rotatable member when thelatter is in its proper position, a source of current-supply and anindicating device in circuit with said'contact device, and means forpreventing said contact device from engaging the rotatable member whenthe latter is not in its proper position or when the journals have wornbeyond a predetermined amount.

. In testimony whereof I affix my signature in presence'of twowitnesses.

ASA M. MATTICE.

Witnesses G. F. DE WEIN, JACOB JACOBSEN.

